Pension and Other Postretirement Benefits (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pensions
Pension and other postretirement benefits expenses
Service cost		$ 36	$ 577	$ 335	$ 1,350
Interest cost		4,917	4,801	9,545	9,696
Expected return on plan assets		(7,576)	(7,449)	(14,983)	(14,983)
Amortization of prior service cost		0	83	27	170
Amortization of actuarial losses		598	420	1,200	838
Curtailment gain	$ (2,575)		(668)	(1,204)	(668)
Settlement loss (gain)		2,980	(731)	2,980	(731)
Net periodic benefit income		(1,620)	(2,967)	(2,100)	(4,328)
Other Postretirement Benefits
Pension and other postretirement benefits expenses
Service cost		2	6	13	19
Interest cost		250	274	512	560
Amortization of prior service cost		0	2	0	5
Amortization of actuarial losses		(37)	(47)	(77)	(73)
Settlement loss (gain)		(250)	0	(250)	0
Net periodic benefit income		$ (35)	$ 235	$ 198	$ 511